the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Measurement report: Sources, sinks and lifetime of NOX in a sub-urban temperate forest at night
Abstract. Through observations of NO, NO2, NOY and O3 in the Rambouillet forest near Paris, France, (as part of the ACROSS campaign, 2022) we have gained insight into nighttime processes controlling NOX in an anthropogenically impacted forest environment. O3 mixing ratios displayed a strong diel profile at the site, which was driven by a variable but generally rapid deposition to soil and foliar surfaces. The O3 diel profile was strongly influenced by relative humidity, which impacted the surface resistance to uptake, and temperature inversion, which influenced the rate of entrainment of O3 from above the canopy. Only when the O3 mixing ratio was sufficiently low (and thus the NO lifetime sufficiently long), were sustained NO peaks observed above the instrumental detection limit, enabling derivation of average NO emission rates from the soil of ~1.4 ppbv h‑1. Observations of the lack of increase in NO2 at night, despite a significant production rate from the reaction of NO with O3, enabled an effective lifetime of NO2 of ⁓0.5–3 h to be derived. As the loss of NO2 was not compensated by the formation of gas- or particle-phase reactive nitrogen species it was presumably driven by deposition to soil and foliar surfaces, or any products formed were themselves short-lived with respect to deposition. By comparison, the daytime lifetime of NO2 with respect to loss by reaction with OH is about 1 day. We conclude that the nighttime deposition of NO2 is a major sink of boundary layer NOX in this temperate forest environment.
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RC1: 'Comment on egusphere-2023-2848', Anonymous Referee #1, 19 Feb 2024
This measurement report eloquently describes measurements of nitrogen oxides and other parameters needed to interpret factors contributing to the emission, chemistry and physical removal. The paper is exceptionally clear, the analysis clear and convincing and the interpretation persuasive. I recommend publication as is.
Citation: https://doi.org/10.5194/egusphere-2023-2848-RC1 -
AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2848/egusphere-2023-2848-AC1-supplement.pdf
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AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
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RC2: 'Comment on egusphere-2023-2848', Anonymous Referee #2, 03 Jul 2024
This study presents observations of NO, NO2, NOy, and O3 in a suburban temperate forest and highlights some important sources and sinks strongly affecting the nighttime chemistry of NOx. They found that the sustained high NO observed under very low O3 conditions could be attributed to the soil NO source, and the lack of nighttime NO2 increase can be related to its the nighttime deposition. Overall, this manuscript has comprehensively described their measurements and conducted an in-depth analysis on the observed nighttime NO2 behaviors in the Rambouillet forest environment. Although the authors didn’t employ box model to support their major conclusions, I do think the current analysis looks reasonable.
I only have a few minor issues. How about aerosol concentrations during the measurements? Does the uptake of NO2 on the aerosol surface affect the NO2 removal at night? I also suggest the authors to add a table to list their ground and tower measurements and this will be helpful for the readers. Lastly, I would encourage the authors to discuss about how to reduce the uncertainties in their estimated NO emissions.
Citation: https://doi.org/10.5194/egusphere-2023-2848-RC2 -
AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2848/egusphere-2023-2848-AC1-supplement.pdf
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AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
Status: closed
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RC1: 'Comment on egusphere-2023-2848', Anonymous Referee #1, 19 Feb 2024
This measurement report eloquently describes measurements of nitrogen oxides and other parameters needed to interpret factors contributing to the emission, chemistry and physical removal. The paper is exceptionally clear, the analysis clear and convincing and the interpretation persuasive. I recommend publication as is.
Citation: https://doi.org/10.5194/egusphere-2023-2848-RC1 -
AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2848/egusphere-2023-2848-AC1-supplement.pdf
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AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
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RC2: 'Comment on egusphere-2023-2848', Anonymous Referee #2, 03 Jul 2024
This study presents observations of NO, NO2, NOy, and O3 in a suburban temperate forest and highlights some important sources and sinks strongly affecting the nighttime chemistry of NOx. They found that the sustained high NO observed under very low O3 conditions could be attributed to the soil NO source, and the lack of nighttime NO2 increase can be related to its the nighttime deposition. Overall, this manuscript has comprehensively described their measurements and conducted an in-depth analysis on the observed nighttime NO2 behaviors in the Rambouillet forest environment. Although the authors didn’t employ box model to support their major conclusions, I do think the current analysis looks reasonable.
I only have a few minor issues. How about aerosol concentrations during the measurements? Does the uptake of NO2 on the aerosol surface affect the NO2 removal at night? I also suggest the authors to add a table to list their ground and tower measurements and this will be helpful for the readers. Lastly, I would encourage the authors to discuss about how to reduce the uncertainties in their estimated NO emissions.
Citation: https://doi.org/10.5194/egusphere-2023-2848-RC2 -
AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2848/egusphere-2023-2848-AC1-supplement.pdf
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AC1: 'Reply on RC1', Simone T. Andersen, 04 Jul 2024
Data sets
Data used in this paper Simone T. Andersen, Max R. McGillen, Chaoyang Xue, Tobias Seubert, Patrick Dewald, Gunther N. T. E. Türk, Jan Schuladen, Cyrielle Denjean, Jean-Claude Etienne, Olivier Garrouste, Marina Jamar, Sergio Harb, Manuela Cirtog, Vincent Michoud, Mathieu Cazaunau, Antonin Bergé, Christopher Cantrell, Sebastien Dusanter, Bénédicte Picquet-Varrault, Alexandre Kukui, Abdelwahid Mellouki, Lucy J. Carpenter, Jos Lelieveld, and John N. Crowley https://across.aeris-data.fr/catalogue/
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